The notion of language dominance is often defined in terms of proficiency. We distinguish dominance, as a property of the bilingual mind and a concept of language knowledge, from proficiency, as a concept of language use. We discuss ways in which language dominance may be assessed, with a focus on measures of mean length of utterance (MLU).…

A discussion of bilingualism and second language learning distinguishes three types of bilingualism, namely, compound, coordinate, and sub-coordinate. A compound bilingual is an individual who learns two languages in the same environment so that he/she acquires one notion with two verbal expressions. A coordinate bilingual acquires the two…

The group of case studies of family bilingualism examined the influences of maternal and paternal native language, schooling choices, travel and residence choices, and family background on development of bilingualism in the children. The families studied include eight Japanese-English bilingual families (one study including five generations) and…